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Finding the Fourth Proportional to 627,000.80, 940,501.20 and 390,221.60

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Solution

The fourth proportional to 627,000.80, 940,501.20 and 390,221.60 is: 585,332.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    627,000.80 : 940,501.20 = 390,221.60 : x
  2. Step 2: Convert to fraction form
    627,000.80/940,501.20 = 390,221.60/x
  3. Step 3: Cross multiply
    627,000.80x = 940,501.20 × 390,221.60
  4. Step 4: Simplify right side
    627,000.80x = 367,003,883,065.92
  5. Step 5: Solve for x
    x = 367,003,883,065.92/627,000.80
  6. Step 6: Final answer
    x = 585,332.40

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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.